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Notes on EE activation, shielding and removal Dave Cockerill 4.3.2009

Notes on EE activation, shielding and removal Dave Cockerill 4.3.2009. Normal LHC running ECAL TDR, fig 9.1 Use the ‘unity’ level as reference, after one day of cooling For long winter access, after 50 days, levels only 40-50% less. 10 yrs. Activation across ES, EE and EB in Sv/h.

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Notes on EE activation, shielding and removal Dave Cockerill 4.3.2009

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  1. Notes on EE activation, shielding and removal Dave Cockerill 4.3.2009

  2. Normal LHC running ECAL TDR, fig 9.1 Use the ‘unity’ level as reference, after one day of cooling For long winter access, after 50 days,levels only 40-50% less 10 yrs

  3. Activation across ES, EE and EB in Sv/h Exp.falloff ECALTDR

  4. Fluence and dose across EE330 Sv/h at inner edge of EE = 0.33mSv/h ECAL EDR04CERN radiation manual 1996 no more than 20mSv in 12 monthsDose limit of 1mSv per week averaged over time at CERN At CERN, nobody should receive whole body dose of 5mSv/yr Inner EE, unshieldedMax time 3hrs in one weekMax time 15hrs in one year Pb, 1MeV photon, attenuationlength ~1cm5cm – attenuation factor 0.7.10-2 => 430hrs for 1mSv at inner EE5cm should be enoughLess needed at outer radii

  5. Activation across ES, EE and EB in Sv/h Exp.falloff Need ‘forward’ Pb to protect from lines of sight to inner region around beam pipe ECALTDR

  6. During shielding and removal Dealing with newly exposed surfaces will need careful consideration

  7. Fluence and dose across EE

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